Scutula igniarii (Nyl.) S. Ekman

in Cannon & al., Revisions of British and Irish Lichens 11: 76, 2021. Basionym: Lecidea igniarii Nyl. - Flora, 50: 328, 1867.
Synonyms: Bacidia abbrevians (Nyl.) Th. Fr.; Bacidia igniarii (Nyl.) Oxner; Bacidia invertens Vain.; Bilimbia igniarii (Nyl.) Arnold
Distribution: N - TAA (Nascimbene & al. 2007b), Lomb, Piem (Piervittori 2003). C - Tosc, Abr (Ravera & al. 2020b, Gheza & al. 2021), Sar (Zedda 2002). S - Cal (Puntillo 1996, Puntillo & Puntillo 2004), Si.
Description: Thallus crustose, episubstratic, rather thin, pale brown-grey, of discrete or contiguous, convex areoles. Apothecia lecideine, barrel-shaped to inversely cone-shaped, 0.2-0.4 mm across, with a flat to slightly convex, black disc and a black (in upper part) to pale yellow-brown (in lower part), persistent proper margin. Proper exciple c. 35 μm wide laterally, without crystals, strongly developed below hypothecium, the outermost part dark brown green (in upper part) to dirty brown or colourless (in lower part), formed by radiating hyphae with cylindrical lumina, the inner part more or less colourless, of narrow, intricately intertwined and richly branched hyphae; epithecium blue green, K- or partly K+ purplish, N+ purple with a precipitate of blue crystals; hymenium colourless in lower part, 40-50 μm high; paraphyses 1.2-2 μm thick at mid-level, the apical cells clavate, 2.8-4 μm wide, often with an external cap of green pigment; hypothecium very pale brown, K+ purplish, N+ orange-red. Asci 8-spored, cylindrical-clavate, with an amyloid tholus and diffuse non-amyloid apical cushion, and an outer amyloid wall layer. Ascospores 3-septate, hyaline, bacilliform to clavate, slightly curved or a few straight, 12-20 x 2.5-3 μm. Photobiont chlorococcoid. Spot tests: thallus K-, C-, KC-, P-, UV-. Chemistry: thallus without lichen substances; apothecia with the Bagliettoana-green and Laurocerasi-brown pigments.
Note: a species found on smooth bark, very rarely on lignum; on the whole a critical taxon, which needs revision.
Growth form: Crustose
Substrata: bark
Photobiont: green algae other than Trentepohlia
Reproductive strategy: mainly sexual
Poorly known taxon in need of further study

Commonnes-rarity: (info)

Alpine belt: absent
Subalpine belt: absent
Oromediterranean belt: absent
Montane belt: rare
Submediterranean belt: extremely rare
Padanian area: absent
Humid submediterranean belt: very rare
Humid mediterranean belt: extremely rare
Dry mediterranean belt: absent

pH of the substrata:

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Solar irradiation:

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Aridity:

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Eutrophication:

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Poleotolerance:

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Altitudinal distribution:

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Predictive model
Herbarium samples
Index Fungorum GBIF


P.L. Nimis CC BY-SA 04
TSB 9287



P.L. Nimis; Owner: Department of Life Sciences, University of Trieste
Herbarium: TSB (9287)
2001/11/22


Courtesy Danièle et Olivier Gonnet - Source: https://www.afl-lichenologie.fr/Photos_AFL/Photos_AFL_S/Text_S3/Scutula_igniarii.htm
France, 28/03/2016 - Bonifacio, alt. 70 m - Corse - (20) - sentier côtier de la côte Accore, sur bois de Juniperus phoenicea mort


Courtesy Danièle et Olivier Gonnet - Source: https://www.afl-lichenologie.fr/Photos_AFL/Photos_AFL_S/Text_S3/Scutula_igniarii.htm
France, 28/03/2016 - Bonifacio, alt. 70 m - Corse - (20) - sentier côtier de la côte Accore, sur bois de Juniperus phoenicea mort


Courtesy Danièle et Olivier Gonnet - Source: https://www.afl-lichenologie.fr/Photos_AFL/Photos_AFL_S/Text_S3/Scutula_igniarii.htm
France, 28/03/2016 - Bonifacio, alt. 70 m - Corse - (20) - sentier côtier de la côte Accore, sur bois de Juniperus phoenicea mort


Courtesy Danièle et Olivier Gonnet - Source: https://www.afl-lichenologie.fr/Photos_AFL/Photos_AFL_S/Text_S3/Scutula_igniarii.htm
France, 28/03/2016 - Bonifacio, alt. 70 m - Corse - (20) - sentier côtier de la côte Accore, sur bois de Juniperus phoenicea mort